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Area Efficient ADC for Low Frequency Application
Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Analog to digital converters (ADCs) are the fundamental building blocks in communication

systems. The need to design ADCs, which are area and/or power efficient, has been common.

Various ADC architectures, constrained by resolution capabilities, can be used for this purpose.

The cyclic algorithmic architecture of ADC with moderate number of bits comes out to be

probably best choice for the minimum area implementation. In this thesis a cyclic ADC is

designed using CMOS 65 nm technology. The ADC high-level model is thoroughly explored and

its functional blocks are modelled to attain the best possible performance. In particular, the

nonlinearities which affect the cyclic/algorithmic converter are discussed. This ADC has been

designed for built-in-self-testing (BiST) on a chip. It is only functional during the testing phase,

so power dissipation is not a constraint while designing it. As it is supposed to be integrated as

an extra circuitry on a chip, its area really matters.

The ADC is designed as 10-bit fully differential switch-capacitor (SC) circuit using 65nm

CMOS process with 1.2V power supply. A two stage Operational Transconductance Amplifier

(OTA) is used in this design to provide sufficient voltage gain. The first stage is a telescopic

OTA whereas the second is a common source amplifier. The bottom plate sampling is used to

minimize the charge injection effect which is present in the switches.

Place, publisher, year, edition, pages
2014. , 68 p.
Keyword [en]
Cyclic ADC, Sample and Hold, Multiply-By-Two-Amplifier, Bottom Plate Sampling, OTA, Area, Low power.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-117413ISRN: LiTH-ISY-EX--14/4820--SEOAI: diva2:807935
Subject / course
Electronic Devices
2014-12-19, Nollstället (3D: 548), Linköping University, Linköping, 10:15 (English)
Available from: 2015-04-28 Created: 2015-04-26 Last updated: 2015-04-28Bibliographically approved

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